المركز الثقب الَّذي الخَيط بِهِ

وَقَد يسمّى قطباً فاِنتبِه

The center is the hole through which the thread

And it may be called a pole so pay heed

وَقَوس الاِرتفاع ما تُحيطُ

بِالربع مِن دائِرَة خُطوط

And the arc of altitude is what surrounds

A quarter of the circle's lines abound